Competition is necessary to breed success. In basketball, an overabundance of talent at one position can create the necessary friction for a player to raise his game to an elite level.
No one in their right mind thinks the Nets have too much talent. They have an All-NBA level center in Brook Lopez. They have a versatile point guard who has led winning teams in Jeremy Lin. The Nets do not have an overflow of talent, however.
They do just so happen to have plenty of guards on their roster, though. At the point guard spot they feature Lin, Isaiah Whitehead and Spencer Dinwiddie.